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Kaley pulled her blonde hair into a fuss-free top knot and wore sunglasses over her make-up free face.

The actress was seen laughing with a female friend as she made her way home after the class.

In fine form: The 30-year-old showed off her long and toned legs in workout wear

Working it out: Kaley wore a white 'Namaste' T-shirt and black gym shorts with bright pink trim, along with black furry sandals

Earlier in the day, Kaley had shared a photo of herself and Chuck Lorre to Instagram in honour of the Big Bang Theory creator's birthday.

'Happy happy birthday to the incomparable Chuck Lorre...you gave me the job of a lifetime 9 years ago and forever changed my life,' she captioned it.

'There is no one like you. Love you to the moon and back! #bts @thebigbangtheory__ #kaleyspolaroids #welikeplaidshirts.'

Natural beauty: The actress, who carried a yoga mat and gym bag, went make-up free under her sunglasses and wore her blonde hair in a fuss-free top knot

Feeling those endorphins: Kaley was seen sharing a laugh with a female friend as she left the class

Kaley has previously revealed that she auditioned twice for the character of Penny, only to be hired after a pilot had been filmed and a decision was made to change up the character.

In 2014, the blonde was asked by TVLine what advice she would give to aspiring actors, and she said: 'That you just never know what’s going to happen. The fact that I auditioned for this show three times and twice didn’t get hired…. It’s about perseverance.

'I remember the third time I went back, I was thinking, “It’s obviously not right for me, I don’t know why they keep bringing me back!” But I’m really glad I did go in that third time, because obviously it changed my life.'

'Love you to the moon and back!': Earlier in the day the Big Bang Theory star shared a snapshot with the show's creator Chuck Lorre on Instagram to wish him a happy birthday

Kaley is now making $1million per episode of the sitcom, and will also be appearing in comedy movie Handsome next year with Natasha Lyonne and Leah Remini.

Meanwhile the former 8 Simple Rules star is currently in a relationship with Karl Cook following the end of her marriage to Ryan Sweeting.

Kaley and Ryan married on New Year's Eve in 2013 after six months of dating, and split after less than two years of marriage. Their divorce was finalised in May.

Third time's a charm: Kaley is now earning $1million per episode on the sitcom, but auditioned and was rejected twice before landing the part